Extension cylinder lock



Nov. 30 ,1926.

F. E. BEST EXTENSION CYLINDER LOCK Filed NOV. 29, 1924 Patented Nov. 30,1926.

UNITED STATES FRANK ELLISON BEST, OF SEATTLE, WASHINGTON.

EXTENSION CYLINDER LOCK. I

Application filed November 29, 1924. Serial No. 752,918.

My invention relates to improvements in extension cylinder locks and theobject of my invention is to improve and simplify the construction oflocks of this nature and to render the same more easy to install andadjust and more efficient in operation.

Another object is to provide a lock of this nature in which theextension member has two tubes rigidly secured thereto and arranged toproject telescopically into tubular recesses in a lock receivingrmemberand in which two screws entering from the front end of the lockreceiving member are threaded into said tubes for relative adjustlnentof the lock receiving member and the extension member, said tubesprojecting outwardly from the end of said extension member and servingas means for securing an externally threaded disc to the end of saidextension member, the ends of the screws within the tubes being expandedto prevent complete separation of the extension member and the lockreceiving member.

Other objects are to provide means for preventing the extension memberfrom rotating on the lock receiving member, to provide separable faceplate'means for the lock receiving member, said face plate means beingarranged to cover the adjusting screws and to provide armor means forpreventing access to the adjusting screws by drilling.

Other and more specific objects will be apparent from the followingdescription taken in connection with the accompanying drawings.

In the drawings Figure 1 is a longitudinal sectional view substantiallyon a broken line 1 1 of Figure 2 of an extension cylinder lockconstructed in accordance with this invention. v

Figure 2 is a view partly in section and partly in elevation of the samesubstantially on broken line 2 2 of Fig. 1.

Figure 3 is a sectional view substantially on broken line 3-3 of Figure1 except that the lock receiving member and the extension member areshown telescoped to their minimum length and a lock core is shown withinthe lock receiving member.

Figure 4 is a detached end view looking down into the extension member.

Referring to the drawings, throughout which like reference numeralsdesignate like parts, 5 designates a lock receiving member that isadapted to telescope int'o an extension member 6. The periphery of thelock ren ceiving member 5 is provided with longitudinally extendingalternate grooves 7 and ridges 8 that interiit with correspondinggrooves 9 and ridges 10 in the extension member 6 and prevent relativerotation of said two members. The lock receiving mem ber is providedwith `an opening 11 of figure 8 cross sectional shape for the receptionof a lock core 12-which has a rotatable key plug 13 and which has alocking gate 14 operated by the use of a key in the lock and arranged toengage behind a shoulder 15 in the lock receiving member to preventremoval of the lock core.

The lock receiving member 5 is provided at the sides of the figure 8shaped opening 11 with two tubular bores 16 for the reception of tubes17 that are rigid with the extension member 6. The tubes 17 areexternally provided with conical flanges 18 that seat in countersunkholes in the end of eX tension member 6 and said tubes 17 extendoutwardly from the end of the extension member 6 through an externallythreaded dise 2() and are expanded at their outer ends as at 21 tosecure the disc 2O to the extension member.

Adjusting screws 22 are insertedfrom the outer end of the lock receivingmember into the tubular bores 16 and screw into tubes 17 to adjustablysecure the lock receiving memn ber and the extension member together,said screws having heads 23 that seat within suitable counterbores inthe contracted outer ends of bores 16 and having their ends eX- pandedas at 24 within the tubes 17 to prevent them from being entirelywithdrawn.

` The heads of the screws 22 are covered by a drill resistant armorplate 25 of hardened metal that is disposed within a shallow counterborein the outer end of the lock receiving member.

The outer end of the lock receiving mem ber 5 is provided with expandedsections 26 beneath which inwardly bent sections 27 Y on a face plate 28are arranged to engage. The expanded sections 26 and inwardly bentsections 27 are each preferably arranged at intervals around lockreceiving member 6 and face plate 28 respectively so that face plate 28may be applied by fitting sections 27 over the end of the lock receivingmember and then turning the face plate to cause the sections 27 toengage beneath expanded sections 26. The construction of this face platelocking feature is more clearly illus Cil ' place b trated and describedin my eopendiug ap plication Serial No. T4 e853, tiled Nov. 14, i924.The -tace plate 28 is provided with a hole ot substantially figure 8shape tor the reception ot the figure 3 shaped loch core, the lock corepreventing the tace plate trom being turned when it is inserted.

The tace plate 2S tits within an escutcheon plate 30 and bears against awasher 3l that seats upon a flange 32 at the bottom ot the escutclieonplate. rEhe washer 3l ts the lock receiving member closely but theopeningin the escuteheon plate 30 is large enough so that saidescutcheon plate may be passe:l over the extension member 6.

The key plug 13 in lock core l2 has two longitudinally extending holes33 tor slidably and telescopically receiving two pins 34 that are rigidwith a disc 35. rilhe disc member 2O on the end ot extension member 6has a hole extending therethrough that is counterbored on the inner sideto aii'ord a shoulder 36 and that has an annular groove 37 in thecounterbored portion. A bushing 38 is rotatably disposed in the hole indisc member 2O and has a head 39 arranged to tit against shoulder 3G. Athrow bar 40 is secured to bushingl 38 by rivets 4l and serves in theusual manner to operate a latch.

The disc is arranged to iit rotatably in the counterbore in disc member2O and has a peripherally disposed expansion ring 42 that is arranged tosnap into groove 37 to releasably secure the disc 35 to disc member 20.Pins 43 on the end ot disc 35 are arranged to operatively engage withbushing 38 for turning the same when the disc 35 is rotated.

The disc member 2O that is rig end ot extension member (3 is arranged toscrew into a latch housing 44 and is locked against rotation in saidlatch housing by a ball 45 that is operatively disposed in a recess 46in the side ot dise 2O and arranged to be forced outwardly by rotationet a cam member 47 into a groove 48 in latch housing 44., The cam member47 has an eccentric groove 50 in which` ball 45 is operatively disposedand said cam 47 is rotatably mount ed in disc 2O and has a transversegroove 5l in its upper end tor the reception of a screw driver bladewhich may be inserted through lock receiving member 5 when the lock corelf2 is removed to turn said cam member 47.

In the installation ot this device the extension cylinder comprising`dise 20 eXtension member G and lock receiving member 5 inserted througha previously prepared opening in a door 52 and made tast toy the latchhousing 44 which is mortised into the door, by screwing disc -O into thelatch housing. After the dise 2O is properly adjusted inthe latchhousing'it is locked in Y forcing ball '45 outwardly into groove 48. Thescrews 22 may then be ad- Gid with the just-ed to draw the lockreceiving member down snugly onto the escutcheon plate 30. A 't'ter thishas been done the armor plate may be applied, the Alace plate 28 placedon the end ot loch receiving men'iber 5 and rotated to locli the same inplace and 'lo properly align the figure 8 hole in the tace plate withthe figure 8 hole in the lool; and the loch core may then be insertedand loelred in place thereby making it impossible to turn the tace plateand preventing any person except one who has the proper key -torremoving the loch core trom `gaining access to the heads ot screws or tothe cam 4T that loc is the extension cylinder against rotation in thelatch housing.

The vforegoing description and accompanying drawings clearly disclose apreterred embodiment ot my invention but it will be understood that thisdisclosure is merely illustrative and that such changes in the inventionmay be made as are within the scope and spirit oi the following claims.

I claim:

l. In an extension cylinder loch7 a lock receiving member havinglongitudinally extending bores7 an extension member, relatively rigidtubes in said extension member arranged to tit slidably within saidbores and screws threaded into said tubes and adjustably connecting saidlock receiving member and said extension member.

2. In an extension cylinder lock, a lock receiving member having twolongitudinally extending bores, an extension member arranged totelescope over said lock receiving member, two rigid tubes in saidextension member arranged to tit slidably within said bores andadjusting screws in said lool: re ceiving member threaded into saidtubes.

3. In an extension cylinder lock. a lock receiving member havinglongitudinally extending bores therein, an extension member slidablethereon7 tubes rigid within said ex tension member and arranged to litslidably within said bores, screws having their heads countersunk intothe end ot said lock receiving member and arranged to extend throughsaid bores and screw into said tubes and tace plate means arranged tocover the heads ot said screws.

4. In an extension cylinder lock, a. lock receiving member, havinglongitudinally e2;- tending bores therein7V an extension member slidableon said lock receiving member, rigid tubes within said extension memberarranged to fit slidably within said bores, screws threaded into saidtubes and extending through said bores and having heads that areeountersunk inthe outer end ot said lock receiving' member, an armorplate ot hardened metal covering theheads ot said screws and a taceplate covering said armor plate. i' k 5. In an extension cylinder loclr,two relalll() tively adjustable telescopic members, screws connectingsaid two telescopic members and having heads disposed at the outer endof the outer telescopic member, an armor plate overlying the heads ofsaid screws and a face plate arranged to be placed over said armorplate.

6. In a lock, a lock receiving member, screws having heads disposed at,and operable from the outer end of said loclt receiving member forsecuring the same to another member, an armor plateoverlying the headsof said screws and a face plate fitting over said armor plate.

7. In an extension cylinder lock a lock receiving member having areceptacle and provided with two longitudinally extending bores, anextension member slidable thereon, two rigid tubes in said extensionmember arranged to telescopel within said bores, screws having theirheads embedded in the outer end of said lock receiving member andextending through said bores and threaded into said tubes, an armorplate covering the heads ol' said screws, a face plate covering saidarmor plate and arranged to be made fast to said lock receiving memberby placing the same thereon and turning, a lock core arranged to litwithin said receptacle, said lock core preventing turning of said faceplate, and throw means arranged to be operated by said lock core.

8. In an extension cylinder lock an extension member, an externallythreaded disc n the end of said extension member and tubes extendingthrough said disc and into said extension member and serving as a meansfor securing said disc and said extension member together.

9. In an extension cylinder lock an extension member, a lock receivingmember arranged to telescope into said extension member and having twobores extending lengthwise thereof, an externally threaded disc on theend of said extension member, two tubes extending through said disc andthrough the bottom of said extension member and litting telescopicallyinto said bores said tubes having flanges abutting against the innerside of the end wall of said extension member and having their outerends expanded to secure said disc to said extension member, andadjusting screws extending through said lock receiving member andthreaded into said tubes.

FRANK ELLISON BEST.

